CN111810667A - Valve body and low-torque opening valve emergency cut-off device for pipeline - Google Patents

Valve body and low-torque opening valve emergency cut-off device for pipeline Download PDF

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Publication number
CN111810667A
CN111810667A CN202010667585.8A CN202010667585A CN111810667A CN 111810667 A CN111810667 A CN 111810667A CN 202010667585 A CN202010667585 A CN 202010667585A CN 111810667 A CN111810667 A CN 111810667A
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CN
China
Prior art keywords
valve
pressure
ring
piston
low
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Granted
Application number
CN202010667585.8A
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Chinese (zh)
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CN111810667B (en
Inventor
柴崇军
刘金超
王璐
贾文刚
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Beijing Polydoctor Petroleum Technology Co ltd
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Beijing Polydoctor Petroleum Technology Co ltd
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Priority to CN202010667585.8A priority Critical patent/CN111810667B/en
Publication of CN111810667A publication Critical patent/CN111810667A/en
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Publication of CN111810667B publication Critical patent/CN111810667B/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
    • F16K31/043—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
    • F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
    • F16K31/05—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor specially adapted for operating hand-operated valves or for combined motor and hand operation
    • F16K31/055—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor specially adapted for operating hand-operated valves or for combined motor and hand operation for rotating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/53—Mechanical actuating means with toothed gearing
    • F16K31/535—Mechanical actuating means with toothed gearing for rotating valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K31/00—Actuating devices; Operating means; Releasing devices
    • F16K31/44—Mechanical actuating means
    • F16K31/53—Mechanical actuating means with toothed gearing
    • F16K31/54—Mechanical actuating means with toothed gearing with pinion and rack
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K43/00—Auxiliary closure means in valves, which in case of repair, e.g. rewashering, of the valve, can take over the function of the normal closure means; Devices for temporary replacement of parts of valves for the same purpose
    • F16K43/001—Auxiliary closure means in valves, which in case of repair, e.g. rewashering, of the valve, can take over the function of the normal closure means; Devices for temporary replacement of parts of valves for the same purpose an auxiliary valve being actuated independently of the main valve
    • F16K43/003—Auxiliary closure means in valves, which in case of repair, e.g. rewashering, of the valve, can take over the function of the normal closure means; Devices for temporary replacement of parts of valves for the same purpose an auxiliary valve being actuated independently of the main valve the auxiliary valve being a rotary valve
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
    • F16K5/08—Details
    • F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
    • F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
    • F16K5/201—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces with the housing or parts of the housing mechanically pressing the seal against the plug

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanically-Actuated Valves (AREA)

Abstract

The invention discloses a valve body and a low-torque opening valve emergency cut-off device for a pipeline, wherein the valve body comprises: a housing; the rotary valve core is positioned in the shell and is provided with a circulation hole; the valve core shaft is arranged on the inner wall of the shell through a bearing, one end of the valve core shaft is fixed with the rotary valve core together and can drive the rotary valve core to rotate, and the other end of the valve core shaft is provided with a gear; the fixed valve seat is fixed in the shell and is positioned on one side of the rotary valve core; the floating valve seat is fixed in the shell and located on the other side of the rotary valve core, the floating valve seat comprises a fixing ring and a floating ring, the fixing ring is fixed on the inner wall of the shell, the floating ring is located in the fixing ring and provided with a blocking wall for blocking the floating ring to be away from the rotary valve core, and a sealing elastic piece for pushing the floating ring to the rotary valve core is arranged between the floating ring and the blocking wall. The invention aims to overcome the defect of large valve opening torque when the existing valve is opened, and provides a valve body and a low-torque opening valve emergency cut-off device for a pipeline.

Description

Valve body and low-torque opening valve emergency cut-off device for pipeline
Technical Field
The invention relates to the field of pressure pipelines. In particular to a valve body and a low-torque opening valve emergency cut-off device for a pipeline.
Background
In gas well production, when a surface line becomes plugged or a choke fails, the pressure rises, resulting in an overpressure in the surface line. And the condition that the pressure of the wellhead is reduced can be caused when the pipeline is corroded or damaged accidentally and leaks. In order to prevent the danger caused by overpressure and the leakage of a large amount of conveyed fluid when leakage occurs, an emergency cut-off device is required to be arranged on the pipeline, and a valve is closed emergently. However, in order to achieve better stage effect, the existing emergency cut-off device can make the combination between the valve core and the valve seat as tight as possible under the condition that the valve is closed, and the valve seat needs to apply a large pressing force to the valve core so as to ensure the sealing effect. However, a large friction force exists between the valve core and the valve seat when the valve core rotates, so that the valve core can be rotated by a large torque to open the valve, the power consumption for opening the valve is large, the field battery can not meet the requirements frequently, and particularly in winter, the valve can not be opened due to serious electric quantity loss.
In addition, the existing valve is opened by applying force to the valve rod through an electrically controlled high-pressure execution cylinder, and the arrangement requires high power of the cylinder, so that the power consumption is high.
Disclosure of Invention
The invention solves the technical problem of overcoming the defects of large valve opening torque and large power consumption when the valve is opened by the conventional emergency cut-off device, and provides a valve body with small valve opening torque.
The valve body of the present invention comprises:
a housing;
the rotary valve core is positioned in the shell and is provided with a circulation hole for allowing fluid to pass through;
the valve core shaft is arranged on the shell through a bearing, one end of the valve core shaft penetrates into the shell and is fixed with the rotary valve core together to drive the rotary valve core to rotate, and the other end of the valve core shaft is positioned outside the shell and is provided with a gear;
the fixed valve seat is annular and is fixed in the shell and positioned on one side of the rotary valve core, and a sealing ring is arranged on one side of the fixed valve seat, which is abutted against the rotary valve core;
the floating valve seat is fixed in the shell and located on the other side of the rotary valve element, the floating valve seat comprises a fixing ring and a floating ring, the fixing ring is fixed on the inner wall of the shell, the floating ring is located in the fixing ring and provided with a blocking wall for blocking the floating ring from being far away from the rotary valve element, a sealing elastic piece for pushing the floating ring to the rotary valve element is arranged between the floating ring and the blocking wall, and a sealing ring is arranged on one side, close to the rotary valve element, of the floating ring.
Preferably, the floating ring is provided with a spring groove parallel to the axis of the floating ring, one end of the sealing elastic piece extends into the spring groove, and the other end of the sealing elastic piece is abutted against the blocking wall.
Preferably, the fixed ring comprises a first ring segment, a second ring segment and a connecting ring segment, the extending directions of the first ring segment and the second ring segment are parallel to the axis of the fixed ring, the floating ring is located inside the second ring segment, the connecting ring segment is connected with the first ring segment and the second ring segment, and the connecting ring forms the blocking wall. The outer wall of the first ring section is fixed with the inner wall of the shell through threads, and the outer wall of the second ring section is provided with a sealing ring so that the second ring section is in sealing fit with the inner wall of the shell. The inner diameter of the second ring section is larger than that of the first ring section, and the inner diameter of the first ring section is the same as that of the floating ring.
The invention also provides a low-torque open valve emergency cut-off device for a pipeline, which comprises a power assembly and the valve body, the power assembly comprises a first valve rod and a second valve rod which are respectively positioned at two sides of the valve core shaft, the first valve rod and the second valve rod are both provided with teeth which can be matched with the gear on the valve core shaft, the first valve rod is sleeved with a valve closing spring, the lower end of the valve closing spring is abutted against the valve body, the upper end of the valve closing spring is abutted against a fixing piece which is fixed on the first valve rod and protrudes out of the first valve rod in the radial direction, the power assembly further comprises a driving device, when the second valve rod moves upwards under the driving of the driving device, the rotating valve core shaft is driven to rotate until the axis of the flowing hole of the rotating valve core is coincident with or parallel to the axis of the fixed valve seat or the floating valve seat so as to completely open the valve, in the process, the first valve rod is driven by the gear to move downwards and the valve closing spring is compressed.
Preferably, the second valve rod is provided with a valve rod limiting structure protruding radially from the outer wall of the second valve rod, the low-torque open valve emergency cut-off device for the pipeline further comprises a locking mechanism, when the pressure of the pipeline is within a set range, the locking mechanism is matched with the valve rod limiting structure to enable the valve to be locked in an open state, when the pressure of the pipeline is higher than the set range or lower than the set range, the locking mechanism is disengaged from the valve rod limiting structure, the first valve rod moves upwards under the action of the pretension of the valve closing spring to drive the gear to rotate, and the first valve rod drives the rotary valve core to rotate until the axis of the through hole of the rotary valve core is perpendicular to the axis of the fixed valve seat or the floating valve seat, so that the valve is completely closed.
Preferably, the locking mechanism comprises a cylinder assembly and a transmission assembly, the transmission assembly is provided with a locking block which can be matched with the valve rod limiting structure, and the cylinder assembly comprises a cylinder body, a motion connecting ring positioned in the cylinder body and a low-pressure piston arranged in the motion connecting ring; the low-pressure piston comprises a piston body which is arranged in the motion connecting ring and can move relative to the motion connecting ring and a piston rod which is positioned on one side of the piston body, and a low-pressure spring is sleeved on the piston rod; the low-pressure piston is provided with a low-pressure spring, the space on one side of the low-pressure piston, which is provided with the low-pressure spring, forms an air inlet space, the space on the other side of the low-pressure piston forms a pressure space, the piston body of the low-pressure piston is provided with an air inlet hole which is communicated with the air inlet space and the pressure space, the cylinder body is also provided with an air passage which is communicated with the air inlet space, and the air passage is; one end of the piston rod extends out of the cylinder body and is connected with the transmission assembly; when the pressure of the pipeline is lower than a set range, the pressure of the pressure space is reduced, the low-pressure spring pushes the low-pressure piston to move towards one end far away from the transmission assembly to compress the axial length of the pressure space, meanwhile, the transmission assembly is driven to move to enable the locking block to leave the valve rod limiting structure to achieve unlocking, and when the pressure of the pipeline is restored to the set range, the pressure of the pressure space is increased to push the low-pressure piston to move in the reverse direction to drive the transmission assembly to move to enable the locking block to be close to the valve rod limiting structure to achieve.
Preferably, the motion connecting ring can move relative to the cylinder and forms a dynamic seal with the inner wall of the cylinder, the motion connecting ring is provided with a limiting step for limiting the maximum distance of the low-pressure piston moving relative to the motion connecting ring in the direction of the transmission assembly, a high-pressure piston is further fixedly arranged inside the motion connecting ring, the distance between the high-pressure piston and the transmission assembly is greater than the distance between the low-pressure piston and the transmission assembly, the pressure space is formed between one side of the high-pressure piston and the low-pressure piston, and the pressure space has an axial length L1The high-pressure piston is provided with a high-pressure spring at one side far away from the low-pressure piston, and the coefficient of stiffness of the high-pressure spring is far higher than that of the low-pressure spring; when the pressure of the pipeline is higher than the set range, the pressure of the air inlet space rises to push the high-pressure piston to overcome the pretightening force of the high-pressure spring to move so as to drive the moving connecting ring and the low-pressure piston to move towards the direction far away from the conveying assembly, so that the transmission assembly acts to enable the locking block to leave the valve rod limiting structure to realize unlocking, when the pressure of the pipeline is restored to the set range, the pressure of the air inlet space is reduced, the high-pressure spring pushes the high-pressure piston to move in the reverse direction, the transmission assembly isAnd locking is realized close to the valve rod limiting structure.
Preferably, the cylinder body is provided with a high-pressure piston limiting mechanism for limiting the movement of the high-pressure piston.
Preferably, the high-pressure piston comprises a piston body, a piston rod and a connecting block for connecting the piston body and the piston rod, a radial protrusion is arranged at the end part of the piston rod close to the piston body, one end of the connecting block is connected with or integrally formed with the radial protrusion, the other end of the connecting block is fixedly connected with the piston body, and the connecting block protrudes out of the high-pressure piston limiting mechanism in the direction towards the low-pressure piston, so that an axial distance L is formed between the high-pressure piston limiting mechanism and the high-pressure piston2The high-pressure spring is sleeved on the piston rod, one end of the high-pressure spring is abutted to the radial protrusion, the other end of the high-pressure spring is abutted to the inner wall of the end part of the cylinder body, and the high-pressure piston limiting mechanism is located between the piston rod and the piston body.
Preferably, the cylinder body of the cylinder comprises a first part close to the transmission assembly and a second part far away from the transmission assembly, the first part is connected with the second part through threads, a sunken groove is formed between the end of the first part and the end of the second part, and the piston limiting structure is a limiting ring positioned in the sunken groove.
Preferably, the transmission assembly comprises a roller bracket, one end of which is provided with a roller, the roller bracket is mounted on a fixed bracket through a first pivot, one end of a piston rod of the low-pressure piston, which penetrates out of the cylinder body, is provided with a pull ring, the pull ring is connected with the roller bracket, the connection position is located between the roller and the first pivot, the transmission assembly further comprises a rocker, the rocker is mounted on the fixed bracket through a second pivot, one end of the rocker is provided with a protrusion matched with the roller, the other end of the rocker is provided with the lock block, the transmission assembly further comprises a pre-tightening spring, the pre-tightening spring is located between the fixed bracket and one end of the roller bracket, which is provided with the roller, when the pipeline pressure is within a set range, the roller is matched with the protrusion under the action of the pre-tightening spring, and when the piston rod of the low-pressure piston drives the pull ring to pull the roller, the roller overcomes the acting force of the pre-tightening spring to be separated from the matching with the bulge of the warping plate, and the warping plate rotates to drive the locking block to leave the valve rod limiting structure of the first valve rod so as to unlock.
Preferably, the other end of the rocker is provided with a threaded hole, the transmission assembly further comprises an adjusting bolt, and one end of the adjusting bolt penetrates through the threaded hole of the rocker to be fixed with the locking block.
Compared with the prior art, the valve body and the low-torque opening valve emergency cut-off device for the pipeline have the following beneficial effects:
1. the valve body of the invention comprises a fixed valve seat and a floating valve seat, a floating ring of the floating valve seat is pressed on the rotary valve core under the action of a sealing elastic piece, and under the state of closing the valve, a circulation hole of the rotary valve core is completely staggered with the circulation space of the valve seat and a joint, so that fluid does not circulate. The rotary valve core is driven to rotate by the rotation of the driving valve core shaft, the floating ring can be in real-time sealing contact with the rotary valve core under the action of pre-elasticity applied by the sealing elastic piece in the rotating process, namely the sealing elastic piece needs smaller pre-tightening force to realize that the floating ring is in close contact with the rotary valve core in the rotating process so as to keep sealing, and therefore, great moment is not needed in the processes of opening and closing the valve.
2. When the pressure of the pipeline is lower than the set range, the pressure of the pressure space is reduced, and the low-pressure spring pushes the low-pressure piston to move towards the end far away from the transmission assembly to compress the axial length L of the pressure space1And the driving transmission assembly acts to enable the locking block to leave the valve rod limiting structure to realize automatic unlocking. After the unlocking, the second valve rod moves upwards under the action of the valve closing spring, the first valve rod moves downwards, the valve shaft rotates anticlockwise, and the valve is automatically closed, so that the fluid is prevented from being continuously leaked. When the leakage is repaired, the first valve rod is lifted through the driving device, the second valve rod descends, the valve closing spring is compressed again, the valve shaft rotates clockwise, the valve is opened, and the pressure of fluid in the pipeline rises. When the pipeline pressure returns to the set range, the pressure of the pressure space risesAnd the low-pressure piston is pushed to move reversely until the low-pressure piston is blocked by the limiting step, and the low-pressure piston drives the transmission assembly to act so that the locking block is close to the valve rod limiting structure to realize automatic locking.
3. When the pressure of the pipeline is higher than the set range, the pressure of the pressure space rises to push the high-pressure piston to overcome the pretightening force of the high-pressure spring to move so as to drive the movable connecting ring to move towards the left side, the limiting step of the movable connecting ring pushes the pressure piston to move towards the left side so as to enable the transmission assembly to act to enable the locking block to leave the valve rod limiting structure to realize automatic unlocking, and the valve is automatically closed. After the reason for causing the superhigh pressure is eliminated, open the valve, when pipeline pressure resumes to set for the scope, the pressure in pressure space reduces, and high-pressure spring promotes high-pressure piston reverse motion, drives the action of transmission assembly and makes the locking piece be close to valve rod limit structure realizes automatic locking.
Drawings
FIG. 1 is a cross-sectional view of a valve body of one embodiment of the present invention with the valve plug shaft in an upright position;
FIG. 2 is an enlarged schematic view of the floating valve seat of FIG. 1;
FIG. 3 is a cut-away schematic view of a low torque open valve emergency shut-off device for a pipeline according to one embodiment of the present invention;
FIG. 4 is a cut-away schematic view of a valve body and power assembly of the low torque open valve emergency disconnect apparatus for a pipeline of one embodiment of the present invention, wherein the valve body of FIG. 4 is a right side view of the valve body of FIG. 3;
FIG. 5 is an enlarged schematic view of the cylinder assembly shown in FIG. 3;
fig. 6 is a schematic diagram showing the engagement of a locking mechanism of the low torque open valve emergency shut-off device for piping according to one embodiment of the present invention, and the locking mechanism of fig. 6 is a top view of the locking assembly of fig. 3.
Reference numerals
11, 12, 121, 13, 14, 15, 16, 161, 17, 171, fixed ring, 1711, 1712, 1713, 172, floating ring, 173, sealing elastic element, 174, 175, 18, second joint, 19, first joint;
21 a first valve rod, 22 a second valve rod, 23 a fixing part, 24 a valve closing spring, 25 a driving device, 26 a manual rotating shaft, 27 a gear, 28 a rotating wheel and 29 a handle;
31 cylinder, 311 first part, 312 second part, 32 motion connecting ring, 33 sealing ring, 34 limit step, 35 low pressure piston, 351 piston body, 352 air inlet hole, 353 piston rod, 354 low pressure spring, 355 air inlet space, 356 pull ring, 36 pressure space, 37 air channel, 38 high pressure piston, 381 piston body, 382 piston rod, 3821 radial projection, 383 connecting block, 384 high pressure spring, 385 high pressure piston limit mechanism, 386 sink groove;
41 roller bracket, 412 roller, 42 first bracket, 43 first pivot, 44 preloaded spring, 45 rocker, 451 bulge, 46 second pivot, 47 second bracket, 48 adjusting bolt, 49 locking block.
Detailed Description
The valve body of the present invention is used for a fluid pipe, as shown in fig. 1, the valve body comprising: the rotary valve comprises a shell 11, a rotary valve core 12 positioned in the shell 11, a fixed valve seat 16 and a floating valve seat 17 for bearing the rotary valve core 12, and a valve core shaft 13 arranged on the shell. In this embodiment, the rotary valve core 12 is a ball valve core, the rotary valve core 12 is provided with a through hole 121 for allowing fluid to pass through, the valve core shaft 13 is mounted on the housing 11 through a bearing 14, one end of the valve core shaft 13 penetrates into the housing 11 and is fixed with the rotary valve core 12 to carry the rotary valve core 12 to rotate, the other end of the valve core shaft 13 is located outside the housing 11, and a gear 15 (see fig. 3) is fixed at the end. When the gear 15 is driven to rotate, the spool shaft 13 and thus the rotary spool 12 are driven to rotate to open or close the valve. Alternative embodiments the rotary valve spool 12 may be cylindrical with the spool shaft 13 coaxial with the flow bore 121 through the cylindrical sidewall.
The fixed valve seat 16 is annular and fixed in the housing 11 and located at one side of the rotary valve element 12, and a sealing ring 161 is disposed at one side of the fixed valve seat 16 abutting against the rotary valve element 12. The side of the housing 11 provided with the fixed valve seat 16 is provided with a first joint 19 for communicating with the conduit, the first joint 19 being fixed to the housing 11. In the present embodiment, the axis of the first joint 19 coincides with the axis of the fixed valve seat 16, and coincides with the axis of the rotary valve body 12 and the axis of the flow hole 121 in a state where the rotary valve body 12 is opened, and the inner diameter of the pipe portion of the first joint 19 is equal to the inner diameter of the fixed valve seat 16 and the inner diameter of the flow hole 121 of the rotary valve body 12.
The floating valve seat 17 is fixed in the housing 11 and located on the other side of the rotary valve core 12, as shown in fig. 2, and the floating valve seat 17 includes a fixed ring 171 and a floating ring 172. The fixed ring 171 is fixed to the inner wall of the housing 11, the fixed ring 171 is formed by two ring segments with different diameters, the floating ring 172 is also formed by a ring segment, the fixed ring 171 is located in the ring segment with the larger diameter of the fixed ring 171, and the axis of the fixed ring 171 and the axis of the floating ring 172 are overlapped and overlapped with the axis of the flow hole 121 of the rotary valve core 12 when the rotary valve core 12 is opened. The variable diameter portion of the fixed ring 171 is a blocking wall (the structure of which is described later) for blocking the floating ring 172 from being far away from the rotary valve core 12, a sealing elastic piece 173 is arranged between the floating ring 172 and the blocking wall to form adjustable elastic force between the floating ring 172 and the rotary valve core 12, and a sealing ring 175 is arranged on one side of the floating ring 172 close to the rotary valve core 12. In the present embodiment, the second joint 18 is further fixed to the side of the housing 11 where the floating valve seat 17 is provided, the axis of the second joint 18 coincides with the axis of the flow hole 121 of the rotary valve body 12 in the open state of the rotary valve body 12, and the inner diameter of the second joint 18 is equal to the inner diameter of the flow hole 121 of the rotary valve body 12 and the inner diameter of the floating ring 172.
In the fixed valve seat 16 and the floating valve seat 17 included in the valve body of the present invention, the floating ring 172 of the floating valve seat 17 is pressed against the rotary valve body 12 by the sealing elastic member 173, and in the closed state, the flow hole 121 of the rotary valve body 12 is completely displaced from the flow spaces of the valve seat and the two joints, and fluid does not flow. The driving valve core shaft 13 rotates to drive the rotary valve core 12 to rotate, the floating ring 172 can be in real-time sealing contact with the rotary valve core 12 under the action of the pre-elasticity applied by the sealing elastic piece 173 in the rotating process, namely, the sealing elastic piece 173 needs smaller pre-elasticity force to realize that the floating ring 172 is in close contact with the rotary valve core 12 in the static and rotating processes so as to keep sealing, and therefore, great moment is not needed in the valve opening and valve closing processes.
As shown in fig. 2, a spring groove 174 parallel to the axis of the floating ring 172 is disposed on the outer side of one end of the floating ring 172 close to the blocking wall 1713, the sealing elastic member 173 is located in the spring groove 174, one end of the sealing elastic member abuts against the bottom wall of the spring groove 174 of the floating ring 172, and the other end abuts against the blocking wall 1713. In this embodiment, the spring groove 174 is an annular spring groove 174 opened in the floating ring 172, and has an axis coinciding with the axis of the floating ring 172, and the seal elastic member 173 is a spring having an axis coinciding with the axis of the spring groove 174. In other embodiments, a plurality of axially disposed spring slots 174 may be formed in a circumferential arrangement, the axis of the spring slots 174 being parallel to the axis of the floating ring 172, and one spring being disposed in each spring slot 174, the axis of each spring being parallel to the axis of the floating ring 172. Through the spring groove 174, a spring or other sealing elastic member 173 can be stably mounted on the floating ring 172 and stably apply a force toward the rotary spool 12 to the floating ring 172, thereby securing the reliability of the valve.
As shown in fig. 2, the fixing ring 171 includes a first ring segment 1711, a second ring segment 1712, and a connecting ring segment 1713, the extending directions of the first ring segment 1711 and the second ring segment 1712 are parallel to the axis of the fixing ring 171, the inner diameter of the second ring segment 1712 is larger than the inner diameter of the first ring segment 1711, and the floating ring 172 is disposed inside the second ring segment 1712, so that the movement direction of the floating ring 172 is ensured to be axial, thereby ensuring the stability of the movement of the floating ring 172. The inner diameter of the first ring segment 1711 is the same as the inner diameter of the floating ring 172. The connecting ring segment 1713 connects the first ring segment 1711 and the second ring segment 1712, the connecting ring segment 1713 forms the blocking wall, and in this embodiment, the connecting ring segment 1713 is perpendicular to the axis of the fixing ring 171.
The outer wall of the first ring segment 1711 is fixed to the inner wall of the housing 11 through a thread, the matching length between the first ring segment 1711 and the housing 11 may determine the pre-tightening force of the elastic sealing element 173, and as can be seen from fig. 1, the larger the matching length between the first ring segment 1711 and the housing 11 is, the smaller the pre-tightening force of the elastic sealing element 173 is, the smaller the matching length between the first ring segment 1711 and the housing 11 is, and the larger the pre-tightening force of the elastic sealing element 173 is. Thus, the amount of force between the floating ring 172 and the rotary spool 12 may be adjusted by adjusting the amount of mating length of the first ring segment 1711 with the housing 11. The outer wall of the second ring segment 1712 is provided with a sealing ring so that the second ring segment 1712 forms a sealing fit with the inner wall of the housing 11.
The invention also provides a low-torque opening valve emergency cut-off device for the pipeline, which is arranged on the gas conveying pipeline and used for conveying emergency cut-off gas. As shown in fig. 3 and 4 in combination with fig. 1, the low torque open valve emergency cutoff device for a pipeline of the present invention includes a valve body and a power assembly, wherein the valve body is the valve body as described above. The power assembly comprises a first valve rod 21 and a second valve rod 22 which are respectively positioned at two sides of the valve plug shaft 13 and are vertical to the valve plug shaft 13. The first valve rod 21 partially penetrates into the housing, and partially is exposed out of the housing of the valve body. The end exposed outside the housing of the valve body is provided with a fixing member 23 protruding radially from the first valve rod 21, in this embodiment, the fixing member 23 has an internal threaded hole, and is matched with the external thread of the first valve rod 21, so as to fix the fixing member 23 and the first valve rod 21. The part of the first valve rod 21, which is positioned outside the housing of the valve body, is sleeved with a valve closing spring 24, the lower end of the valve closing spring 24 abuts against the housing of the valve body, and the first upper end abuts against the fixing piece 23. The part penetrating into the housing is provided with teeth cooperating with a gear 15 on said valve plug shaft 13.
The second stem 22 extends partially into the housing and partially out of the housing of the valve body. The part penetrating into the housing is provided with teeth cooperating with a gear 15 on said valve plug shaft 13. In this embodiment, the first valve stem 21 and the second valve stem 22 are both racks, and both sides of the first valve stem and the second valve stem are provided with the teeth on the sides close to the spool shaft 13.
The power assembly further comprises a driving device 25 connected with one end of the second valve rod 22 exposed out of the housing of the valve body, and when the second valve rod 22 moves upwards under the driving of the driving device, the second valve rod 22 drives the valve core shaft 12 to rotate clockwise in fig. 4 until the axis of the flow hole 121 of the rotary valve core 12 is coincident with or parallel to the axis of the fixed valve seat 16 or the floating valve seat 17 so as to completely open the valve, in the process, the first valve rod 21 is driven to move downwards by the gear 15 and the valve closing spring 24 is compressed.
In the present embodiment, the driving device 25 is a motor that drives the second valve rod 22 to move upward through a speed reduction and crank linkage, and such a driving device 25 is per se prior art. In other embodiments, second valve stem 22 may be driven to move upward by a driving device such as an air cylinder.
In this embodiment, as shown in fig. 3, the power assembly further includes a manual rotation shaft 26, a gear 27 fixed at one end of the manual rotation shaft 26, a rotation wheel 28 fixed at the other end of the manual rotation shaft 26, and a handle 29 provided on the rotation wheel 28, wherein the gear 27 is engaged with the gear 15 of the valve plug shaft 13, and when the handle 29 is rotated, the gear 15 on the valve plug shaft 13 and the valve plug shaft 13 can be driven to rotate by the gear 27 on the manual rotation shaft 26, so as to open the valve. In the event of a failure of the drive 25, opening of the valve can be effected by rotating the handle 29.
The second valve stem 22 is provided with a stem stop (not shown) projecting radially from its outer wall at the portion of the second valve stem exposed from the housing of the valve body. In this embodiment, the power assembly further comprises a guide housing for guiding and protecting the portion of the second valve stem exposed outside the housing of the valve body. The guide housing is provided with a locating hole for the relevant part of the locking mechanism to extend into the guide housing to cooperate with the valve stem limiting structure (the structure and the sign of the locking mechanism are described later). When the pressure of the pipeline is in a set range, the locking mechanism is matched with the limiting structure, so that the valve is locked in an open state. When the pressure of the pipeline is higher than the set range or lower than the set range, the locking mechanism is disengaged from the valve rod limiting structure, the first valve rod 21 moves upwards under the action of the pretightening force of the valve closing spring 24 to drive the gear 15 to rotate so as to drive the rotary valve core 12 to rotate until the axis of the flow hole 121 of the rotary valve core 12 is perpendicular to the axis of the fixed valve seat 16 or the floating valve seat 17, so that the valve is completely closed, and in the process, the second valve rod 22 moves downwards.
As shown in fig. 3, 5 and 6, the locking mechanism includes a cylinder assembly and a transmission assembly driven by the cylinder assembly, and in this embodiment, the cylinder assembly is provided on the top wall of the housing of the valve body. The transmission assembly is provided with a locking block 49 (shown in fig. 6) that can cooperate with the valve stem limiting structure. As shown in fig. 5, the cylinder assembly includes a cylinder block 31 fixed to the housing of the valve body, a movement connection ring 32 forming a dynamic seal with the inner wall of the cylinder block 31, and a low pressure piston 35 provided in the movement connection ring 32. The low pressure piston 35 includes a piston body 351 disposed in the motion connecting ring 32 and capable of moving relative to the motion connecting ring 32, and a piston rod 353 disposed at one side of the piston body 351, wherein the piston rod 353 is sleeved with a low pressure spring 354.
The space of the low pressure piston 35 on the side where the low pressure spring 354 is provided constitutes an intake space 355, the space of the low pressure piston 35 on the other side constitutes a pressure space 36, and the axial length of the pressure space 36 is L1When L is present1At maximum, the end of the moving coupling ring 32 abuts the inner wall of the cylinder end, and when the line pressure is at or above the set range, the air pressure in the pressure space 36 causes L to be generated1The maximum is maintained, i.e. the end of the kinematic connection ring 32 is against the inner wall of the cylinder end. In this embodiment, L1Has a maximum length of 2 mm.
The piston body 351 of the low pressure piston 35 is provided with an air inlet hole 352 communicating the air inlet space 355 and the pressure space 36, the cylinder body 31 is further provided with an air passage 37 communicating with the air inlet space 355, and the air passage 37 communicates with the inside of the pipe. One end of the piston rod extends out of the cylinder body 31 to be connected with the transmission assembly. The moving connecting ring 32 has a limit step 34 for pushing the low pressure piston 35 to move away from the transmission assembly.
When the pressure in the pipe is lower than the set range due to leakage, the pressure in the pressure space 36 is reduced, and the low-pressure spring 354 pushes the low-pressure piston 35 to move to the end far away from the transmission assembly (i.e. to the left in fig. 5) to compress the axial length L of the pressure space 361And simultaneously, the driving transmission assembly is driven to act to enable the locking block 49 to leave the valve rod limiting structure to realize unlocking. After unlocking, the first valve rod 21 moves upwards in fig. 4 under the action of the valve closing spring 24, the second valve rod 22 moves downwards, the valve plug shaft 13 rotates anticlockwise in fig. 4, and the valve is closed, so that the fluid is prevented from further leaking.
When the leak is repaired, the second valve rod 22 is lifted by the driving means 25 while the first valve rod 21 is lowered, the valve closing spring 24 is recompressed while the valve shaft is rotated clockwise in fig. 4, the valve is opened, and the fluid pressure in the pipe rises. When the pipeline pressure is restored to the set range, the pressure of the pressure space 36 is increased, the low-pressure piston 35 is pushed to move reversely until the low-pressure piston 35 is blocked by the limiting step 34, and the low-pressure piston 35 drives the transmission assembly to act so that the locking block 49 is close to the valve rod limiting structure to realize locking. The position of the limit step 34 for the low pressure piston 35 is defined at the same time as it indirectly defines the position of the lock piece 49 when cooperating with the limit mechanism of the second valve stem 22, i.e. in the locked state. In this embodiment, the plane of the direction of movement of lock block 49 is perpendicular to the plane of the direction of movement of second valve stem 22.
The motion connecting ring 32 can move in the cylinder 31, the outer wall of the motion connecting ring 32 is provided with a sealing ring 33, a dynamic seal is formed between the motion connecting ring 32 and the inner wall of the cylinder 31, and the motion connecting ring 32 is provided with a limit step 34 for limiting the maximum distance of the low-pressure piston 35 moving relative to the motion connecting ring 32 in the direction of the transmission assembly (the right side in fig. 5). When the moving connection ring is moved toward the direction (left side in fig. 5) in which the moving connection ring 32 moves away from the transmission assembly, the piston body 351 of the low pressure piston 35 may be moved in the direction away from the transmission assembly by being pushed by the limit step 34 of the moving connection ring 32.
As shown in fig. 5, a high-pressure piston 38 is further fixedly disposed inside the motion connecting ring 32, a distance between the high-pressure piston 38 and the transmission assembly is greater than a distance between the low-pressure piston 35 and the transmission assembly, the pressure space 36 is formed between a piston pressure-bearing end surface of the high-pressure piston 38 and a pressure-bearing end surface of the low-pressure piston 35, and a high-pressure spring 384 is disposed on a side of the high-pressure piston 38 away from the low-pressure piston 35. The stiffness coefficient of the high-pressure spring 384 is much higher than that of the low-pressure spring 354, when the pressure in the pipe is in a set range or lower than the set range, the high-pressure piston 38 is regarded as not being pushed, and only when the pressure in the pipe is greater than the set range, the high-pressure piston 38 is pushed.
When the pipeline pressure is higher than the set range, the pressure in the pressure space 36 rises to push the high-pressure piston 38 to move against the pre-tightening force of the high-pressure spring 384 so as to drive the moving connecting ring 32 to move to the left in fig. 5, and the limit step 34 of the moving connecting ring 32 pushes the low-pressure piston to move to the left so as to actuate the transmission assembly to enable the locking block 49 to be separated from the valve rod limit structure to realize unlocking, and the valve is closed. When the reason for the ultrahigh pressure is eliminated, the valve is opened through the driving device 25 or the rotating handle 29, when the pipeline pressure is restored to the set range, the pressure in the pressure space 36 is reduced, the high-pressure spring 384 pushes the high-pressure piston 38 to move reversely (to the right in fig. 5), and the transmission assembly is driven to act to enable the locking block 49 to approach the valve rod limiting structure to realize locking.
The cylinder block 31 is provided with a high-pressure piston limiting mechanism (the structure and reference numerals of which are described later) that limits the movement of the high-pressure piston 38, and the high-pressure piston limiting mechanism limits the position of the high-pressure piston 38 in the unlocked state and also indirectly limits the position of the lock piece 49 in the unlocked state.
In this embodiment, as shown in fig. 5, the high-pressure piston 38 and the low-pressure piston 35 are disposed opposite to each other, the high-pressure piston includes a piston body 381, a piston rod 382, and a connecting block 383 connecting the piston body 381 and the piston rod 382, an end of the piston rod 382 close to the piston body 381 is provided with a radial protrusion 3821, an end surface of the connecting block 383 and the radial protrusion 3821 are fixedly connected or integrally formed at a middle portion of an end surface of the radial protrusion 3821, another end surface of the connecting block 383 is fixedly connected to the piston body 381, the limiting mechanism 385 is further disposed on a periphery of the end of the radial protrusion 3821, and the connecting block 383 protrudes from the high-pressure piston limiting mechanism 385 in a direction toward the low-pressure piston 35, so that an axial direction is provided between the high-pressure piston limitingDistance L2. The high-pressure spring 384 is sleeved on the piston rod 382, one end of the high-pressure spring abuts against the radial protrusion 3821 at the end of the piston rod 382, and the other end of the high-pressure spring abuts against the inner wall of one end of the cylinder 31. The high pressure piston limiting mechanism 385 is located between the piston rod 382 and the piston body 381. L is compressed when the high pressure piston 38 moves toward the limiting mechanism 3852The axial length L of the pressure space 361And remains maximum at high pressure. In this embodiment, L1And L2The maximum values of (A) and (B) are all 2 mm.
As shown in fig. 5, in the present embodiment, the cylinder 31 of the cylinder comprises a first portion 311 close to the transmission assembly and a second portion 312 remote from the transmission assembly, wherein the piston rod 382 of the high pressure piston 38 and the high pressure spring 384 are located inside the second portion 312, and the piston body 381 of the high pressure piston 38, the piston body 351 connecting the moving ring 32 and the low pressure piston 35, the piston rod 353 and the low pressure spring 354 are located inside the first portion 311. The first part 311 is connected with the second part 312 through threads, a sunken groove 386 is formed between the inner wall of the end part of the first part 311 and the inner wall of the end part of the second part 312, and the high-pressure piston limiting structure 385 is a limiting ring positioned in the sunken groove 386.
As shown in fig. 6, the transmission assembly includes a roller bracket 41 having a roller 412 at one end, the roller bracket 41 is mounted on the first bracket 42 by a first pivot 43, one end of a piston rod 353 of the low pressure piston 35 extends out of one end of the cylinder 31 and is provided with a pull ring 356, and the pull ring 356 is connected to the roller bracket 41 at a position between the roller 412 and the first pivot 43.
The transmission assembly further comprises a rocker 45, the rocker 45 is mounted on the second bracket 47 through a second pivot 46, one end of the rocker 45 is provided with a protrusion 451 matched with the roller 412, the other end of the rocker 45 is provided with the locking block 49, and the second pivot 46 is located between the protrusion 451 and the locking block 49. The transmission assembly further comprises a pre-tightening spring 44, the pre-tightening spring 44 is located between the cylinder body 31 and one end, provided with the roller 412, of the roller support 41, and when the pipeline pressure is within a set range, the roller 412 is matched with the protrusion 451 under the action of the pre-tightening spring 44. In the present embodiment, the first bracket 42 and the second bracket 47 are both fixed brackets fixed to the cylinder 31.
When the piston rod 353 of the low-pressure piston 35 drives the pull ring 356 to pull the roller bracket 41 to rotate clockwise in fig. 6, the roller 412 is disengaged from the protrusion 451 of the rocker 45 against the acting force of the pre-tightening spring 44, and the rocker 45 rotates clockwise in fig. 6 to drive the lock block 49 to leave the valve rod limiting structure of the first valve rod 21, so as to unlock the valve rod.
As shown in fig. 6, a threaded hole is formed at the other end of the rocker 45, the transmission assembly further includes an adjusting bolt, and one end of the adjusting bolt passes through the threaded hole of the rocker 45 and is fixed with the lock block 49. By adjusting the bolt 48, the position of the lock block 49 can be adjusted more precisely.
The above embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and the scope of the present invention is defined by the claims. Various modifications and equivalents may be made by those skilled in the art within the spirit and scope of the invention.

Claims (14)

1. A valve body, comprising:
a housing;
the rotary valve core is positioned in the shell and is provided with a circulation hole for allowing fluid to pass through;
the valve core shaft is arranged on the shell through a bearing, one end of the valve core shaft penetrates into the shell and is fixed with the rotary valve core together to drive the rotary valve core to rotate, and the other end of the valve core shaft is positioned outside the shell and is provided with a gear;
the fixed valve seat is annular and is fixed in the shell and positioned on one side of the rotary valve core, and a sealing ring is arranged on one side of the fixed valve seat, which is abutted against the rotary valve core;
the floating valve seat is fixed in the shell and located on the other side of the rotary valve element, the floating valve seat comprises a fixing ring and a floating ring, the fixing ring is fixed on the inner wall of the shell, the floating ring is located in the fixing ring and provided with a blocking wall for blocking the floating ring from being far away from the rotary valve element, a sealing elastic piece for pushing the floating ring to the rotary valve element is arranged between the floating ring and the blocking wall, and a sealing ring is arranged on one side, close to the rotary valve element, of the floating ring.
2. Valve body according to claim 1, wherein the floating ring is provided with a spring groove parallel to the axis of the floating ring, one end of the sealing elastic element extending into the spring groove and the other end abutting against the blocking wall.
3. The valve body according to claim 2, wherein the fixed ring comprises a first ring segment, a second ring segment and a connecting ring segment, the first ring segment and the second ring segment extend in a direction parallel to the axis of the fixed ring, the floating ring is located inside the second ring segment, the connecting ring segment connects the first ring segment and the second ring segment, and the connecting ring forms the blocking wall.
4. The valve body as claimed in claim 3, wherein the outer wall of the first ring segment is fixed with the inner wall of the casing through threads, and the outer wall of the second ring segment is provided with a sealing ring so that the second ring segment is in sealing fit with the inner wall of the casing.
5. The valve body of claim 3, wherein the inner diameter of the second ring segment is greater than the inner diameter of the first ring segment, and the inner diameter of the first ring segment is the same as the inner diameter of the floating ring.
6. An emergency cut-off device of a low-torque opening valve for a pipeline, which is characterized by comprising a power assembly and a valve body according to any one of claims 1 to 5, wherein the power assembly comprises a first valve rod and a second valve rod which are respectively positioned at two sides of a valve core shaft, the first valve rod and the second valve rod are respectively provided with teeth which can be matched with a gear on the valve core shaft, a valve closing spring is sleeved on the first valve rod, the lower end of the valve closing spring is abutted against a shell of the valve body, the upper end of the valve closing spring is abutted against a fixing piece which is fixed on the first valve rod and radially protrudes out of the first valve rod, the power assembly further comprises a driving device, when the second valve rod moves upwards under the driving of the driving device, the rotating valve core shaft is driven to rotate until the axis of a circulation hole of the rotating valve core is coincident with or parallel to the axis of a fixed valve seat or a floating valve seat so as, in the process, the first valve rod is driven by the gear to move downwards and the valve closing spring is compressed.
7. The emergency cutoff device according to claim 6, wherein the second valve rod is provided with a valve rod limiting structure protruding radially from an outer wall thereof, the emergency cutoff device for the low torque opening valve for a pipeline further comprises a locking mechanism, when the pressure of the pipeline is in a set range, the locking mechanism is engaged with the valve rod limiting structure so that the valve is locked in an open state, when the pressure of the pipeline is higher than the set range or lower than the set range, the locking mechanism is disengaged from the valve rod limiting structure, the first valve rod moves upward under the action of the pretension of the closing spring so as to drive the gear to rotate, and thus the rotary valve core is driven to rotate until an axis of the through hole of the rotary valve core is perpendicular to an axis of the fixed valve seat or the floating valve seat, so that the valve is completely closed.
8. The emergency cutoff device according to claim 7, wherein the locking mechanism comprises a cylinder assembly and a transmission assembly, the transmission assembly being provided with a locking block engageable with the valve stem limiting structure, the cylinder assembly comprising a cylinder body, a kinematic coupling ring located within the cylinder body, and a low pressure piston provided within the kinematic coupling ring; the low-pressure piston comprises a piston body which is arranged in the motion connecting ring and can move relative to the motion connecting ring and a piston rod which is positioned on one side of the piston body, and a low-pressure spring is sleeved on the piston rod; the low-pressure piston is provided with a low-pressure spring, the space on one side of the low-pressure piston, which is provided with the low-pressure spring, forms an air inlet space, the space on the other side of the low-pressure piston forms a pressure space, the piston body of the low-pressure piston is provided with an air inlet hole which is communicated with the air inlet space and the pressure space, the cylinder body is also provided with an air passage which is communicated with the air inlet space, and the air passage is; one end of the piston rod extends out of the cylinder body and is connected with the transmission assembly; when the pressure of the pipeline is lower than a set range, the pressure of the pressure space is reduced, the low-pressure spring pushes the low-pressure piston to move towards one end far away from the transmission assembly to compress the axial length of the pressure space, meanwhile, the transmission assembly is driven to move to enable the locking block to leave the valve rod limiting structure to achieve unlocking, and when the pressure of the pipeline is restored to the set range, the pressure of the pressure space is increased to push the low-pressure piston to move in the reverse direction to drive the transmission assembly to move to enable the locking block to be close to the valve rod limiting structure to achieve.
9. The emergency cutoff device according to claim 8, wherein the motion coupling ring is movable relative to the cylinder and forms a dynamic seal with the inner wall of the cylinder, the motion coupling ring is provided with a limiting step for limiting the maximum distance of the low pressure piston moving relative to the motion coupling ring in the direction of the transmission assembly, a high pressure piston is further fixedly arranged inside the motion coupling ring, the distance between the high pressure piston and the transmission assembly is greater than the distance between the low pressure piston and the transmission assembly, the pressure space is formed between one side of the high pressure piston and the low pressure piston, and the pressure space has an axial length L1The high-pressure piston is provided with a high-pressure spring at one side far away from the low-pressure piston, and the coefficient of stiffness of the high-pressure spring is far higher than that of the low-pressure spring; when the pressure of the pipeline is higher than the set range, the pressure of the air inlet space rises to push the high-pressure piston to overcome the pretightening force of the high-pressure spring to move so as to drive the moving connecting ring and the low-pressure piston to move towards the direction far away from the conveying assembly, so that the transmission assembly acts to enable the locking block to leave the valve rod limiting structure to realize unlocking, when the pressure of the pipeline is restored to the set range, the pressure of the air inlet space is reduced, the high-pressure spring pushes the high-pressure piston to move in the reverseThe action of the transmission assembly enables the locking block to be close to the valve rod limiting structure to achieve locking.
10. The emergency disconnect device of claim 9, wherein the cylinder block is provided with a high-pressure piston limiting mechanism that limits movement of the high-pressure piston.
11. The emergency cut-off device according to claim 10, wherein the high-pressure piston comprises a piston body, a piston rod and a connecting block connecting the piston body and the piston rod, the end of the piston rod close to the piston body is provided with a radial protrusion, one end of the connecting block is connected or integrated with the radial protrusion, the other end of the connecting block is fixedly connected with the piston body, and the connecting block protrudes out of the high-pressure piston limiting mechanism in the direction towards the low-pressure piston, so that an axial distance L is formed between the high-pressure piston limiting mechanism and the high-pressure piston2The high-pressure spring is sleeved on the piston rod, one end of the high-pressure spring is abutted to the radial protrusion, the other end of the high-pressure spring is abutted to the inner wall of the end part of the cylinder body, and the high-pressure piston limiting mechanism is located between the piston rod and the piston body.
12. The emergency cut-off device according to claim 11, wherein the cylinder body of the cylinder comprises a first portion close to the transmission assembly and a second portion far from the transmission assembly, the first portion is connected with the second portion through threads, a sunken groove is formed between the end of the first portion and the end of the second portion, and the piston limiting structure is a limiting ring positioned in the sunken groove.
13. The emergency cut-off device according to claim 11, wherein the transmission assembly comprises a roller bracket having a roller at one end thereof, the roller bracket being mounted on the fixed bracket via a first pivot, a piston rod of the low pressure piston being provided with a pull ring at an end thereof extending out of the cylinder, the pull ring being connected to the roller bracket at a position between the roller and the first pivot, the transmission assembly further comprising a rocker plate mounted on the fixed bracket via a second pivot, one end of the rocker plate being provided with a protrusion engaged with the roller, the other end of the rocker plate being provided with the lock block, the transmission assembly further comprising a pre-tightening spring, the pre-tightening spring being provided between the fixed bracket and the end of the roller bracket provided with the roller, the roller being engaged with the protrusion under the action of the pre-tightening spring when the pipe pressure is within a set range, when the piston rod of the low-pressure piston drives the pull ring to pull the roller wheel support to rotate, the roller wheel overcomes the acting force of the pre-tightening spring to be separated from the matching with the bulge of the warping plate, and the warping plate rotates to drive the locking block to leave the valve rod limiting structure of the first valve rod, so that unlocking is realized.
14. The emergency disconnect device of claim 13, wherein the other end of the rocker is provided with a threaded hole, the transmission assembly further comprising an adjusting bolt, one end of the adjusting bolt passing through the threaded hole of the rocker to be fixed to the lock block.
CN202010667585.8A 2020-07-13 2020-07-13 Valve body and low-torque opening valve emergency cut-off device for pipeline Active CN111810667B (en)

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CN112682567A (en) * 2020-12-17 2021-04-20 浙江福瑞科流控机械有限公司 Driving device capable of reducing valve operation torque
CN113108078A (en) * 2021-04-10 2021-07-13 哈尔滨艾拓普科技有限公司 Petroleum pipeline valve

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